The sBlock Elements - Result Question 33

####39. Sodium is made by the electrolysis of a molten mixture of about 40 and 60 because

[1995]

(a) Ca2+ can reduce NaCl to Na

(b) Ca2+ can displace Na from NaCl

(c) CaCl2 helps in conduction of electricity

(d) this mixture has a lower melting point than NaCl

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Solution:

  1. (d) Sodium is obtained by electrolytic reduction of its chloride. Melting point of chloride of sodium is high (803C) so in order to lower its melting point (600C), calcium chloride is added to it.


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